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Farmall & IHC Tractors Discussion Forum
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H motor rebuild

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landlord7012

04-11-2008 15:42:36




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I'm tearing down my H motor which was stuck from sitting 25 years under a leaky roof. With the head off, cylinders 1, 2, and 3 don't look too bad and I should be able to free them with little or no force. Number 4 is "petrified" from being full of some muddy-pulpy gunk and will require brute force to free. I plan on replacing the liners, pistons etc. anyway so my question is this: do I need to free that piston up or should I leave it in and pull the motor and just unbolt the rod from the crank and pull the piston and sleeve together? My thinking is to save the abuse to the rod and crank if possible (and a little time and energy :) ).

I must add that I am glad I listened to those who say "take the head off" 'cause I couldn't imagine the damage I would have done if I could have freed it with all the cocktails I used. The inside of the manifold looked like a cave full of stalagtites and stalgmites. I'm not criticizing those who have freed motors without disassembling them as I'm sure there are varying degrees of "stuck" but just acknowledging the fact that sometimes haste makes waste. Pulling the head put a whole new light on things!

Thanks in advance,
Bill

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landlord7012

04-11-2008 19:51:47




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 Re: H motor rebuild in reply to landlord7012, 04-11-2008 15:42:36  
Thanks everyone! I plan on ordering a complete rebuild kit (once I know the block and head are sound) with some of my tax refund. I have to replace the clutch too. I think I'll start drilling on that piston this weekend and keep you guys posted.

Have a great weekend!
Bill



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Andy Motteberg

04-11-2008 19:03:22




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 Re: H motor rebuild in reply to landlord7012, 04-11-2008 15:42:36  
Soak your pistons in PB Blaster and or brake fluid, it works every time for me.

Good luck with your H.

Andy.



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Steven f/AZ

04-11-2008 17:08:14




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 Re: H motor rebuild in reply to landlord7012, 04-11-2008 15:42:36  
Speaking from experience here, have the block checked for cracks before sticking a bunch of new parts in it.

I had a very stuck piston due to water in the cylinder on my H, got it all apart and everything looked fine. The machine shop cleaned it up, installed new cam bearings, plugs, etc. and I got it home and saw the crack all the way down that cylinder. Wasted time and money.

Good to hear of progress and that you were much better off safe than sorry!

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Janicholson

04-11-2008 16:44:03




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 Re: H motor rebuild in reply to landlord7012, 04-11-2008 15:42:36  
I would drill a series of tangent ooles (about 1/4"drill) to remove the top of the piston. Then use a muffler chisel to cut down the inside of a drilled hole to split the piston (90degrees from the wrist pin) to collapse it. Then remove the piston. The sleeve can be expanded so much from corrosion of thepiston rings, that removal can crack the block casting under the thin sleeve. JimN



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El Toro

04-11-2008 16:37:55




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 Re: H motor rebuild in reply to landlord7012, 04-11-2008 15:42:36  
You should pull the engine. It probably needs to be dipped anyway. New cam bearings should be installed too. Soak those pistons with ATF. You may need to have your local auto machine shop to press them out. Your crankshaft should be measured for wear too. If the vavles are thin I would replace them with new valves, guides and springs. Take pictures during the teardown they will be helpful later. Hal

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